Any recommendation for directory script?

1) that is free. I need it for try out.
2) Permission to edit the script and modify accordingly.
3) Easy to integrate DMOZ! directory and do adjustments.
4) Easy to integrate multi-search (i.e. google, yahoo, kanoodle) all in one search result page.
5) Easy to play around in rearranging the design.
6) Good back admin for approval of site and altering the search and directory.

If the first criteria does not meet, please provide the URL for the paid script.

Also I would hope to have a rough quotation of a custom script as such.